They've been evolving constantly since our last test in 2008. We brushed up on eight fresh models, from a supermarket steal to a top-of-the-line buy. Here, three that came out sparkling.

Philips Sonicare DiamondClean

This rechargeable ($220, amazon.com) wins the day for its "super-sleek" design, power ("like a pressure washer"), and extras, including a second brush head and a glass that doubles as a charging station. Five quiet modes make for a customized clean.

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